I am a hobbyist and recently bought from an Italian reseller an EM406A module ( S.N. 0019917). I am planning to use the module with an Arduino UNO board that is also providing the 5 V for power. I tested the board with a couple of programs and everything works fine: the module gets a fix, the LED starts blinking and I am able to read the NMEA messages on my PC. What apparently does not work is the 1PPS pulse out of pin 6. I was expecting a pulse between 2 to 3V every second , as soon as the module got the fix, but this is not so. If I connect an oscilloscope between pin 6 and ground I only see very weak (around 270 mV) RANDOM pulses. Am I doing something wrong?